Crankshaft And Balancer Shaft; Removing The Crankshaft And Balancer Shaft; Checking The Oil Nozzles; Checking The Crankshaft - Yamaha MT-09 2021 Service Manual

EAS31171
REMOVING THE CRANKSHAFT AND
BALANCER SHAFT
1. Remove:
• Balancer shaft "1"
• Balancer shaft journal bearing
• Crankshaft assembly "2"
• Crankshaft journal bearing
TIP
Identify the position of each balancer shaft jour-
nal bearings and crankshaft journal bearings so
that it can be reinstalled in its original place.
2
EAS31174

CHECKING THE OIL NOZZLES

The following procedure applies to all of the oil
nozzles.
1. Check:
• Oil nozzle
Damage/wear → Replace the oil nozzle.
• Oil passage
Obstruction → Blow out with compressed air.
EAS31075

CHECKING THE CRANKSHAFT

1. Measure:
• Crankshaft runout
Out of specification → Replace the crank-
shaft.
Runout limit
0.030 mm (0.0012 in)
G089017

CRANKSHAFT AND BALANCER SHAFT

2. Check:
• Crankshaft journal surfaces
• Crankshaft pin surfaces
• Bearing surfaces
3. Measure:
• Crankshaft-journal-to-crankshaft-journal-
ECA13920
NOTICE
Do not interchange the crankshaft journal
bearings. To obtain the correct crankshaft-
journal-to-crankshaft-journal-bearing clear-
ance and prevent engine damage, the crank-
1
shaft journal bearings must be installed in
their original positions.
a. Clean the crankshaft journal bearings,
b. Place the upper crankcase upside down on
c. Install the crankshaft journal upper bear-
TIP
Align the projections "a" on the crankshaft jour-
nal upper bearings with the notches "b" in the up-
per crankcase.
G089019
d. Put a piece of Plastigauge® "1" on each
TIP
Do not put the Plastigauge® over the oil hole in
the crankshaft journal.
5-81
Scratches/wear → Replace the crankshaft.
bearing clearance
Out of specification → Replace the crank-
shaft journal bearings.
Journal oil clearance
0.013–0.037 mm (0.0005–0.0015
in)
crankshaft journals, and bearing portions of
the crankcase.
a bench.
ings "1" and the crankshaft into the upper
crankcase.
crankshaft journal.
1
a
b